Thanks Aaron.
It's a "nice to have". I'm glad you understand my ramblings
Be very useful for the increasing number of people using L3DT with the Atlas system in Torque to produce realistic maps.
Most likely "teaching your granny to suck eggs" but here's how I think the process would be:
Water map generating settings, option to specify direction rainfall falls across the map, and I guess wind strength.
These two values can be converted into settings like the light map, azimuth/elevation.
By lightmap I just mean that yellow/black calculation display, not the final map itself.
Then somehow adjusting the base watermap so that black areas on the rainfall map are 50% drier (customisable setting?).
I don't think you would need to worry about areas that get lots of rain. It could be the watermap is at 100% "wetness" by default.